Paper-break detector switch



Sept. @1927. 1,641,658

H. BERGLUND PAPER BREAK DETECTOR SWITCH Filed May 13. 1922 lilll milg N1 #20 InVentprZ Herman Berglund,

y Mfl w His Attorney.-

Patented Sept. 6, 1927.

UNITED STATES 7 1,641,658 PATENT OFFICE.

HERMAN BERGLUND, OF BROOKLYN, NEW YORK, ASSIGNOR TO GENERAL ELECTRICCOMPANY, A CORPORATION OF NEW YORK.

PAPER-BREAK DETECTOR SWITCH.

Application filed May 13,

Paper break detector switches have heretofore been provided for openingthe control'circuit of the driving motor of a printing press or the likewhen the web breaks, so

as to deenergize the motor and stop the equipment. In order to againstart the equipment and before threading the paper through the press,some arrangement must be provided for restoring the control of thedriving motor, despite the operation of the paper break detector switch.Arrangements have heretofore been provided foreffecting this result, butthese prior arrangements have been complicated and expensive. H One ofthe objects of my invention is to provide a paper break detector switcharranged so that when the paper breaks, the switch mechanism will beoperated to deencrgize the driving motor and when it is desired to againstart up the press, control is restored to the ordinary motor controllerby simply raising the finger which writes on the paper out ofcooperative relation with the paper and holding the finger in thatposition by suitable means, as for example, a spring catch. This, andother objects of my invention, as will be in part apparent to thoseskilled in the art and in part fully explained hereinafter, areaccomplished by the paper break detector switch shown in theaccompanying drawings which show an embodiment of the invention for thepurpose of explaining the features thereof.

Referring to the drawing Fig. 1 is a side view of a paper break detectorswitch with the finger which writes on the web of paper in its normalposition on the web of paper; Fig. 2 is a similar view showing therelative positions of the parts when the paper breaks; Fig. 3 is a topplan view of the switch shown in Fig. 1; Fig. 4 shows the manner inwhich the finger which writes on the paper and the arm which cooperateswith the switch mechanism are held so that the press may be restartedand the paper threaded through the press after the web is broken; Fig. 5is a very simplified diagram of a system of motor control for thedriving motor of the press.

Referring to the drawings, the paper break detector switch therein showncomprises normally closed switch mechanism having a contact disc 10which is adapted to cooperate with a pair of stationary contacts 11 inthe control circuit of the motor. This 1922. Serial No. 560,858.

contact disc is biased to the closed position of the contacts by meansof the coil spring 12. The button 13 of insulating material is connectedwith the disc 10 for the purpose of moving the disc out of engagementwith its stationary contacts against the action of the spring 12. Themember 14; is pivoted at 15 so as to be biased by gravity to,a positionat which the arm 16 will cooperate with the button 13 so as to open theswitch'and at long as the web ofpaper is not broken, the

finger 17 will rest onthe'. web ofpaper so as to hold the arm 16 out ofcooperative relation withthe button13 fand permit the switch contactdiscto beheld in its normally closed position. When'the paper breaks asshown in Fig. 2, the member 14 drops due to the bias of gravity and thearm '16 makes engagement with the button 13 so-as to move the disc 10out of engagement with the stat onary contacts 11. The electromagneticline switch 20 is thereby deenergized and the motor 21 is disconnectedfrom the source of supply 22. It will be understood by those skilled inthe art that in the ordinary equipment for driving a printing press, acontroller of some suitable sort will be provided for starting, stoppingand regulating the speed of the driving motor 21. I have not shown sucha controller and its connections since those skilled in the art willreadily supply a suitable arrangement. The pilot switch 23 will then beopened so that when the detector switch is closed, the starting of themotor will be under the control of the operator. In order to restart themotor and thread the paper through the press, all that need be done isto raise the member 14 out of cooperation with the web of paper to theposition shown in Fig. 4 at which the spring catch 19 makes a holdingengagement with the projection 18. The finger of the member 14 is thusmoved out of the way of the paper and does not interfere with threadingthe paper through the press, and furthermore the contact disc ispermitted to assume its normal position in engagement with thestationary contacts 11. The operator may start the press at any timedesired by simply reclosing the pilot switch I p The device is neat andcompact and cheap to manufacture. The single-casting 24 with,

its cover 25 on which the spring catch 19 is mounted serves as a casingor container for the switch parts and this casting also serves as acouplingor junction for tl'i'e'cablecond'uits 26""a'nd 27'wliichfprotect"theffwires leading" to the switch. i device is veryconvenient in' t'ha't ii'hen the pape breaks the, pressin seed donotli'ing"more"than turn the detector arm back until c'aii ht byitsfsping 'catch'lihd th is'held in" itjs' rereated e en a er? t iaatl ate and5 the paper throir'gli. the

rmaecomgmewith the provisions" i gtli'e repieserit'ithebest embodimentthereof but I si i rat nssho'wn is only that the iin eiitioii 'may be'carried' out by other 'i to' it: understood that the appsmeans.

Whatlcla'im as'new and desire to secure I by Leitters' Patent ofaieUnaatsrtrgQ is:

1, A paper break detector switch comprising'ai movablememberfadaptedtorest on the paper; switch mechanismcontrolled rth and 'n eans forholding the sai'd ine'n'l'be'r out of cooperative relationwith the saidswitch mechanism and .o 'ut'f of engaging [relat on with, the 'ap r.

2. A paper break detector switch comprisingj a pivoted in ember the"free e'pd of which with i the pape "pivoted member having an arm biasedto open the saidswitchmeehanism and a finger adapte l' 'to rest o1i the"paper so as to hold the Said arm'ou t of-engagement with the saidswitch" mechanism 'i'intil the paper brea' xspa prqct on on the saidmember; and a spring catch cooperating with the said loperationfwithwhe"pa r and the saida'rm o gbr cog eraav'e relation :with the said"i'wtahi'm c a i' w t e-A .iiaiierlifik ete t r s e: p ismg aa aa apse tpr'mf aiua i li' for there 0t arranged to rest an; the; paper, switchmechan sm within the v casing normally out of "cooperative relation withthe said arm wli en t'hejarinis hel d by the P PQ n-dama e 9" be "Q Peat fl y" th said arm 'wl n ciunted "on a fire. papa b ak a tllm an thesaid, casing cooperating w tn the arm-t0 lioldthegsarne'out ot co eperati ye relation with the said'switeh.

i'e t f n in relati mechanisi In witness' lix her-eo f; I have hereiintoset nd. s 2d ay. o ay, 922..

' H-E BE G U D.

said casing and the other end

